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... HST . Are STIS wavelengths measured in vacuum? ... Data . ... HST Peer Review Process . ... HST Overview . Overview . ... Phase I Proposing . ... Phase II Cycle 23 . ... Retrieving HST Data . ... Data Analysis . ... Instruments . ... HST Science Year in Review . ... STIS . Instrument Design . ... Phase I . ... Instrument Handbook . STIS Data Handbook . ... Indeed, all the wavelengths used in STIS products are measured in vacuum. See Section 13.2.1 of the STIS Instrument Handbook. ...

Next: An overview Up: The discovery of pulsars Previous: Identification with rotating neutron . unsuccessful optical search for PSR 1919+21 . optical pulsations from the Crab pulsar [ 9 ] . optical data before radio discovery not analysed [ 36 ] . ... X-ray data before radio discovery not analysed [ 10 ] . Figure 3: The Crab pulsar. This pair of photographs was taken using a stroboscopic technique, showing the pulsar on (left) and off (right). ...

... Observatory . ... Science . ... Science Users Information > Data Handling and Products > Data Reduction FAQ > How can I 'extract' lines from the arc and match them to wavelengths? ... Science Users Information . Observing Facilities . La Silla Paranal Observatory . Paranal Facilities . La Silla Facilities . ... Observing with ESO Telescopes . ... Science Data Products Forum . ... Science Archive Facility . ... ESO Data . ... ESO Data Access Policy . ... ESO Science Newsletter . ...

Diffuse interstellar bands -- a survey with precise wavelengths . ... We present an atlas of 271 diffuse interstellar bands (DIBs) between 4460 and 8800A based on echelle spectra (R=45,000), more than 100 of which are new DIB discovered in this survey. It is restricted mostly to narrow features and we describe the tests for an interstellar origin. ... new . ... new W-type . figure10, figure11 . ... figure11 . ... figure13, figure14 . ... figure14 . ... figure19 . ... figure21 . ...

Building the Foundation for U.S . Astronomy at m/cm Wavelengths in 2010 and Beyond Community Workshop (*) Workshop SOC/LOC Robert Brown (NAIC) Chris Carilli (NRAO) Jim Cordes (US SKA Consortium) Dale Frail (NRAO) B. Murray Lewis (NAIC) K. Y. Lo (NRAO) Emmanuel Momjian (NAIC) Yervant Terzian (US SKA Consortium) (Special thanks to Billie Rodriguez, Jill Tarbell and Joan Martin) * Support provided by NSF, NRAO, and NAIC R. L ...

... Optical depth at 100 MHz 122-127 F6.4 --- e_Tau ? ... The highest absorption is observed in the direction of G0.0+0.0. ... G0.9+0.1 is a classic example of a composite, two-component SNR including an extended (8') source with a steep (a=-0.64) spectrum and a central, more compact, component (2') with a flat spectrum (a=-0.1) [49]. ... The highest absorption was observed for four sources in the direction of the galactic central region: 1, 2, 3, and the unidentified source G0.4+0.1 [t(100MHz)=6-0.8]. ...

Classroom Activity: Making a Rainbow . ... When white light from the Sun or a light bulb passes through a prism, the light splits into its component wavelengths. ... Red, blue, green colored filters - if possible, cut 1x4-inch pieces of the filters for each student . ... Many students have the misconception that filters somehow dye the light a certain color. ... Younger students can draw the rainbow and make up a mnemonic for remembering the order of the colors (such as, ROY G. BIV). ...

The CHIANTI database consists of 4 primary ASCII files for each ion in the database. contains the energy levels in cm^(-1) It includes both experimental data and theoretical values of the levels energies. References: %observed energy levels: Fuhr et al, 1999, NIST Atomic Spectra Database Version 2.0 %produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration % % Ken Dere May 3 2001 . ... contains the spline fits to the scaled proton collision strengths. ...

The Milky Way's Center . ... Credit Copyright: NASA , COsmic Background Explorer (COBE) Project . Explanation: NASA's COBE satellite scanned the heavens at infrared wavelengths in 1990 and produced this premier view of the central region of our own Milky Way Galaxy. The Milky Way is a typical spiral galaxy with a central bulge and extended disk of stars. However, gas and dust within the disk obscure visible wavelengths of light effectively preventing clear observations of the center . ...

These are very prominent absorption lines is most all galaxies. ... These pair of absorption lines will appear in all the spectra and they should be your principle source for determining the redshift. ... When this applet opens you will see an iconic representation of galaxies in the left hand side of the applet and a target area in the right side of the applet. ... Note: What you are doing in this excercise is identical to what Hubble did in the 1920's and you are using the same galaxies. ...

... A radio galaxy is a galaxy that emits an unusually big amount of energy at radio wavelengths. ... Inside of each galaxy with an active nucleus (radio galaxies are among them) there must be a system of a "central machine" responsible for the colossal amount of the emitted energy from radio to gamma ranges. ... Sometimes a radio source in an active galaxy may flare again if the needed conditions appear (a new portion of matter would fall into the furnace of the "central machine"). ...

is split into spectral colours, corresponding to wavelength. Red light has long wavelengths, blue light has short wavelengths. from hot objects are continuous , like a rainbow . atoms only emit light of specific colours, revealing their fingerprints as a line spectrum . atoms in front of a hot object absorb light at these colours, giving an absorption spectrum . are predominantly absorption spectra . next

True Color Image Gallery: Galactic SNR | Magellanic Cloud SNR . ... Radio Images Page . ... Exposure uf . ... Exposure uf Exposure time of unfiltered event file . Exposure f Exposure time of filtered event file . Click left mouse button on hyperlink below to download file . ... Event 2 FITS File . ... AUX file . ... see fit detail page for more about the fit. see chandra spectrum page for region used. Images in Several Energy Bands . True Color Image . ... Radio Images . ... 1.0" . ...

Astronotes Armagh Planetarium's Stellar Blog! ... Stars . ... Starbursts are short-lived events, stars are forming so quickly that the reservoirs of interstellar gas from which stars are coalescing would be used up on a timescale much shorter than the age of the galaxy . ... Strong stellar winds from giant new stars in the starburst region combine with the blasts of supernovae to push a mighty flood of extremely hot gas, a ?superwind? from the galaxy thousands of light years into intergalactic space. ...

. Cambridge . MRAO . Bojan Nikolic web pages home . Next: Science at Q-band meeting, Manchester . Previous: European Radio Interferometry School 2009 | . This is the lecture I gave at the European Radio Interferometry School: . http://www.mrao.cam.ac.uk/~bn204/publications/2009/NikolicERIS2009.pdf . Please enable JavaScript to view the comments powered by Disqus. blog comments powered by Disqus . Copyright 2012, Bojan Nikolic feedback welcome

... 2001 December 28 . Starlight Reflections . ... Explanation: Interstellar dust grains often find themselves in a reflective "mood". Near a bright star, clouds of these dust particles scatter short wavelengths of visible starlight more readily than long wavelengths, producing lovely blue reflection nebulae. ... Along the bottom are NGC 2023 ( near the Horsehead), NGC 7023 ( Iris Nebula ), and finally bright star Merope surrounded by a veil of dust ( NGC 1435 ). ... About APOD | ...

... At optical wavelengths, each detected event corresponds to a 'fractional' photon count, dependent on gain variations over the CCD and modulo-8 fixed pattern noise (due to the OM centroiding algorithm). ... This task applies these corrections using the OM in-orbit flatfield (as produced by OMFLATGEN ) and the OM OSW modulo-8 map (produced by OMMODMAP ). ... This image is suitable for OMMODMAP . ... The flatfielded image produced is currently corrected using the existing Image Mode task OMMODMAP . ...

grdfft - Perform mathematical operations on grdfiles in the frequency domain grdfft in _ grdfile -G out _ grdfile [ -A azimuth ] [ -C zlevel ] [ -D [ scale |g ] ] [ -E [ x|y ][ w ] ] [ -F [ x | ... The horizontal dimensions of the grdfiles are assumed to be in meters. ... Append a scale to multiply by (kr * scale ) instead. Alternatively, append g to indicate that your data are geoid heights in meters and output should be gravity anomalies in mGal. Default is no scale]. ...

This enormous section of the Milky Way galaxy is a mosaic of images from NASA's Wide-field Infrared Survey Explorer. ... The colors used in this image represent specific wavelengths of infrared light. Blue and cyan (blue-green) represent light emitted at wavelengths of 3.4 and 4.6 microns, which is predominantly from stars. Green and red represent light from 12 and 22 microns, respectively, which is mostly emitted by dust. ...